Improvement in cutting attachments for sewing-machines



A. T. PERRINE.

Cutting Attachments for Sewing-Machines. N0 140,159. Pa tentedlune24,l873.

UNITED STATES PATENT OFFICE.

ALFRED T. PERRINE, OF OHARLESTOWN, ASSIGNOR TO JOHN HITCHOOOK,

TRUSTEE, OF BOSTON, MASSACHUSETTS.

IMPROVEMENT IN CUTTING ATTACHMENTS FOR SEWING-MACHINES.

Specification forming part of Letters Patent No. 140,159, dated June 24, 1873; application filed J une '7, 1873.

To all whom it may concern:

Be it known that I, ALFRED T. PERRINE, of Oharlestown, in the county of Middlesex and State of Massachusetts, have invented a new and useful Improvement in Cutting and Trimming Attachments for Sewing-Machines, of which the following, taken in connection with the accompanying drawings, is a specification My invention relates to a device to be attached to a sewing-machine, and to be operated thereby, for the purpose of cutting the material sewed to shape at the same time that it is sewed, and is designed more especially for use upon leather work; and it consists in the attachment to the needle-bar of a sewin g-machine of a knife, secured thereto by means of a hinge-joint, the axis of which is outside of the line of cut, as will be more fully described. It further consists in connecting said knife to the needle-bar by means of a tapered hinge-pin, by the use of which the friction of the hinge-joint may be easily regulated, so as to insure the knife being held in place while being drawn outof the leather, as will be described.

In the drawings, Figure 1 is a longitudinal section of a portion of the bed of a sewingmachine, and a front elevation of a portion of the needle-bar with my improvement attached. Fig. 2 is a transverse section on line :0 a; on Fig. 1. Fig. 3 is the same view as Fig. 1, with the needle-bar moved down so as to show' the knife just commencing to cut. Fig. 4 is a plan of the needle-plate, and Fig. 5 an elevation of the knife removed.

A is the bed of the-machine, to which is secured in the usual manner the needle-plate B, in which is formed the usual hole a for the passage of the needle, and the oblong slot 1) for the passage of the knife. 0 is the shuttle-race formed upon the underside of the bed A. D is the needle-bar, to the lower end of which is screwed the car-plate c, to which is pivoted, by means of the tapered pin d, the chisel or othershaped knife or cutter 6, so formed that the cutting-edge shall be between its pivotal point and the needle,

with a shoulder thereon which bears against the lower end of the needle-bar, by which it is forced through the material as the needlebar descends.

The fulcrum-pin d is made taperin g, as shown, for the purpose of facilitating the tightening of the hinge'joint, and to create friction therein so as to prevent the friction of the material from displacing the knife when it is being withdrawn therefrom. The knife in its downward movement, after passing through the material, shown in Fig. 3, enters the slot 1) in the needle-plate B.

I-am aware that a knife for trimming the material sewed has been secured to the needlebar of a sewingmachine before, but, so far as my knowledge extends, it has heretofore been fixed rigidly thereto by means of a screw or similar securing device; but such mode of attachment has been found to be inconvenient and decidedly objectionable, from the fact that the knife was always in the way of setting the needle, and quite often it is desirable to sew a seam without cutting, in which case the knife had to be removed entirely, which necessarily occasioned considerable loss of time.

By the use of my improvement these objections are entirely overcome, for in case the needle is to be set, or a seam is to be sewed without using the knife, the knife is turned up to the right, as shown in dotted lines in Fig. 1, and when it is desired to use the knife again it may be instantly and easily brought into working position by a slight pressure of the thumb or finger.

I do not therefore claim, broadly, the use of a knife attached to the needle-bar of a sewing-machine for the purpose of trimming or cutting the material at the same time that it is sewed; but

What I claim as new, and desire to secure by Letters Patent of the United States, is-

1. A cutter attachedto the needle-bar of a sewing-machine by means of a hinged joint, and arranged to be swung to one side, substantially as described, for the purposes specified. it

2. The cutter e, constructed as herein set bar, snbstantialy as described, for the purpose forth, and pivoted to the needle-bar of a specified. sewing-machine, with its cutting-edge in a Executed at Boston this 4th day of J unc, plane between said pivotal point and the 1873.

needle substantially as described. ALFRED T. PERRINE.

3. In combination with the cutter e and the Witnesses:

needle-bar of a sewing-machine, the taper S. A. WOOD,

pin (1 for securing said knife to the needle- 'N. G. LOMBARD. 

